[Dr. Emmett Brown is doubting Marty McFly's story about that he is from the future]Dr. Emmett Brown: Then tell me, "Future Boy", who's President in the United States in 1985?Marty McFly: Ronald Reagan.Dr. Emmett Brown: Ronald Reagan? The actor?[chuckles in disbelief]Dr. Emmett Brown: Then who's VICE-President? Jerry Lewis?[rushing out and down a hill toward his laboratory]Dr. Emmett Brown: I suppose Jane Wyman is the First Lady!Marty McFly: [following Doc] Whoa! Wait! Doc!Dr. Emmett Brown: And Jack Benny is Secretary of the Treasury.Marty McFly: [outside the lab door] Doc, you gotta listen to me.Dr. Emmett Brown: [opens the door to the lab] I've had enough practical jokes for one evening. Good night, Future Boy![closes the door leaving Marty outside]Marty McFly: No, wait! Doc. Doc. The-the-the bruise - the bruise on your head. I know how that happened! You told me the whole story. You were standing on your toilet, and you were hanging a clock, and you fell, and you hit your head on the sink. And that's when you came up with the idea for the Flux Capacitor...[somberly]Marty McFly: Which... is what makes time travel possible.[Doc opens the door and looks at Marty with a stunned look on his face]

Marty McFly: Lorraine, What are you doin'?Lorraine Baines: I swiped it from the old lady's liquor cabinet.Marty McFly: Yeah, well, you shouldn't drink.Lorraine Baines: Why not?Marty McFly: Because you... you might regret it later in life.Lorraine Baines: Marty, don't be such a square. Everybody who's anybody drinks.Marty McFly Geez! You smoke too?Lorraine Baines: Marty, you're beginning to sound just like my mother!

Dr. Emmett Brown: You're late, do you have no concept of time?Marty McFly: Hey c'mon, I had to change, you think I'm going back in that, that zoot suit? The old man really came through, it worked!Dr. Emmett Brown: What?Marty McFly: He laid out Biff in one punch! I never knew he had it in him! He never stood up to Biff in his life!

What if I send it in and they don't like it? What if they say I'm no good? What if they say "Get out of here, kid. You got no future." I mean, I just don't think I can take that kind of rejection. Jesus, I'm starting to sound like my old man!

Marty McFly: This is uh... This is heavy duty, Doc. This is great. Uh... does it run, like... on regular unleaded gasoline?Dr. Emmett Brown: Unfortunately no, it requires something with a little more kick - plutonium.Marty McFly: Uh... plutonium? Wait. Are you telling me that this sucker is nuclear?Dr. Emmett Brown: Hey, hey, hey. Keep rolling. Keep rolling, there. No, no, no. This sucker's electrical, but I need a nuclear reaction to generate the 1.21 jigawatts of electricity I need.

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[Marty places headphones over his father's ears and wakes him up by playing Van Halen music at full blast. George wakes up screaming - Marty pauses the music. George looks up to see Marty, who is unrecognizable because he is wearing a radiation suit]George McFly: Who are you?Marty McFly: [after giving him another earful of loud rock music] Silence Earthling! My name is Darth Vader. I am an extraterrestrial from the planet Vulcan![makes Live Long and Prosper sign with his hand]

[Biff is waxing George's car, it's a silver BMW]George McFly: Uh... now Biff, I want make sure that we get two coats of wax this time. Not just one.Biff Tannen: Just finishing up the second coat now.George McFly: Now Biff, don't con me!Biff Tannen: I-I'm-I'm sorry, Mr. McFly. I-I meant I was just starting on the second coat.George McFly: Ahh... Biff. What a character. Always trying to get away with something. I've had to stay on top of Biff ever since High School. Although if it wasn't for him...Lorraine Baines: We never would have fallen in love.George McFly: That's right.